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The CSS3 validator does not support HSL, HSLA or RGBA values in text-shadow. Reduction: Try validating this CSS: * { text-shadow: 1px 1px 1px rgba(0, 0, 0, .6); text-shadow: 1px 1px 1px hsla(180, 50, 0, .6); text-shadow: 1px 1px 1px hsl(180, 0, 0); } you will get 3 errors: 2 * Value Error : text-shadow Too many values or values are not recognized : 1px 1px 1px rgba(0,0,0,0.6) 1px 1px 1px rgba(0,0,0,0.6) 3 * Value Error : text-shadow Too many values or values are not recognized : 1px 1px 1px hsla(180,50,0,0.6) 1px 1px 1px hsla(180,50,0,0.6) 4 * Value Error : text-shadow Too many values or values are not recognized : 1px 1px 1px hsl(180,0,0) 1px 1px 1px hsl(180,0,0)
This bug still active and is responsible for blocking the validation of hundreds of new websites that use CSS3 with RGBA. Is there any estimate for a fix?
HSL/HSLA/RGBA are supported in CSS3, however it is likely that text-shadow is not up-to-date for CSS3 but that is another issue, so closing this one.